Subway for electric-current wires or cables



(No Model.)

' J. MAGFARLANB.

-SUBWAY FOR ELBGTRIG CURRENT WIRES 0R CABLES. No. 361,276. PanentedApr.v19,' 1887"L NYM Inventor.

Ny PETERS, Fhelmulhogrlphur. Wuhman, D. C:

UNITED STATES PATENT OEEicE.,

JAMES MACFARLANE, OF MALDEN, MASSACHUSETTS.

SUBWAY FOR ELECTRIC-CURRENT WIRES OR `CABLES.

SPECIFICATION forming part of Letters Patent No. 361.276, dated April19, 1887.

Application filed October 2l, 1886. Serial No. 216,822. (No model.)

l To all whom Lt may concern:

Figure l is a transverse section, and Fig. 2.

a longitudinal section,of asubway embodying my invention, the nature ofwhich is defined in the claims hereinafterpresented. Fig. 3 is a sideview of one of the internal tubes, while Figs. 4 and 5are side views ofthe two kinds of segmental saddles used in supporting within a main pipethe series of internal pipes to be described.

The main pipe A, as wellas each of the interior or auxiliary pipes, B,contained in such main pipe, is constructed in sections, butted end toend, and coupled at their ends by short pipes C, into which the sectionsextend,a suitable cement, which is a non-conductor of electricity, beingused between the next adjacent surfaces ofthe coupling and those of thepipes. Each section of pi peis composed of a series of ilexile strips ofwood, each being bent around in a spiral with each coil at its edge oredges in|contact with that or those next adjacent. Having thus woundonelayer into a tubular form on asuitable cylinder or core, the nextlayer is to bewound on the first one,

so as to breakjoints with it. So on,each layer is to be so wound, someof them being wound in a direction opposite to that of the others.Between each two next adjacent layers there is to be a water-proof layerof cement,which is a non-conductor of electricity.

In the drawings the main-pipe sections are shown as each composed offour such layers, ab c d, with a layer, e, of insulating-cement,

as mentioned, between each layer and theone next to and surrounding it.Extending lengthwise in the main pipe so constructed is the series ofauxiliary pipes B, each being made substantially like the main pipe.rlhese pipes, being arranged as represented in Fig. 1-that is, one withits axis coincident with that of the main pipe and the rest at equaldistances apart in a circle concentric with and sur- Such saddlesoperate to keep the internal pipes,

'B, through which the electricalcurrent wires or cables are to extend,at their proper distances asunder.

A subway thus made is to be laid in the earth of a street or. otherplace, as water or gas pipes are usually laid therein. It will not onlyhold the electrical Wires or cables, but iusulate them from thesurrounding earth.

I do not claim for underground telegraph wires or cablesa conduitcomposed of a series of grooved slabs having wire nettings embeddedwithin them, all as set forth in the United States Patent No. 351,697,as my invention involves not only a main pipe and a series of auxiliaryand smaller pipes, (these latter being arranged within such main pipeequal distances apart inV a circle concentric with and surrounding thecentral pipewith the sets of segmental saddles placed in the main pipeand with respect to it and the auxiliary pipes substantially as setforth.

2. In a subway or underground conduit for electric wires, essentially asdescribed, each sectional pipe A or B composed of a series of strips ofwood, each Wound spirally and having each coil of it at its edge oredges in contact with that or those next adjacent, such coiled stripsbeing disposed'concentrically one within the other and having betweeneach two next adjacent ones a layer of water-proof cement connectingthem to each other, all being substantially as represented.

JAMES llIaCl/RLANEa Witnesses:

R. H. EDDY, R. B. TOREEY.

